feat(lexarg): Add --fail-fast flag

See rust-lang/rust#142859

Author: epage

crates/libtest-lexarg/src/lib.rs

@@ -108,6 +108,7 @@ Options:
         --ignored       Run only ignored tests
         --include-ignored 
                         Run ignored and not ignored tests
+        --fail-fast     Don't start new tests after the first failure
         --no-capture    don't capture stdout/stderr of each task, allow
                         printing directly
         --show-output   Show captured stdout of successful tests
@@ -221,6 +222,9 @@ impl TestOptsBuilder {
             Long("exact") => {
                 self.opts.filter_exact = true;
             }
+            Long("fail-fast") => {
+                self.opts.fail_fast = true;
+            }
             Long("color") => {
                 let color = parser
                     .next_flag_value()

crates/libtest2-mimic/tests/testsuite/mixed_bag.rs

@@ -1019,7 +1019,7 @@ test result: FAILED. 2 passed; 1 failed; 5 ignored; 0 filtered out; finished in
 #[test]
 fn fail_fast() {
     check(
-        &[],
+        &["--fail-fast"],
         101,
         str![[r#"
 
@@ -1028,10 +1028,6 @@ test bear  ... ignored
 test bunny ... ignored
 test cat   ... ok
 test dog   ... FAILED
-test fly   ... ignored
-test fox   ... ok
-test frog  ... ignored
-test owl   ... ignored
 
 failures:
 
@@ -1042,7 +1038,7 @@ was not a good boy
 failures:
     dog
 
-test result: FAILED. 2 passed; 1 failed; 5 ignored; 0 filtered out; finished in [..]s
+test result: FAILED. 1 passed; 1 failed; 2 ignored; 0 filtered out; finished in [..]s
 
 
 "#]],
@@ -1057,7 +1053,7 @@ test result: FAILED. 2 passed; 1 failed; 5 ignored; 0 filtered out; finished in
 #[cfg(feature = "json")]
 fn fail_fast_json() {
     check(
-        &["-Zunstable-options", "--format=json"],
+        &["-Zunstable-options", "--format=json", "--fail-fast"],
         101,
         str![[r#"
 [
@@ -1145,48 +1141,6 @@ fn fail_fast_json() {
     "name": "dog",
     "status": "failed"
   },
-  {
-    "event": "case_start",
-    "name": "fly"
-  },
-  {
-    "elapsed_s": "[..]",
-    "event": "case_complete",
-    "message": "fails",
-    "name": "fly",
-    "status": "ignored"
-  },
-  {
-    "event": "case_start",
-    "name": "fox"
-  },
-  {
-    "elapsed_s": "[..]",
-    "event": "case_complete",
-    "name": "fox"
-  },
-  {
-    "event": "case_start",
-    "name": "frog"
-  },
-  {
-    "elapsed_s": "[..]",
-    "event": "case_complete",
-    "message": "slow",
-    "name": "frog",
-    "status": "ignored"
-  },
-  {
-    "event": "case_start",
-    "name": "owl"
-  },
-  {
-    "elapsed_s": "[..]",
-    "event": "case_complete",
-    "message": "fails",
-    "name": "owl",
-    "status": "ignored"
-  },
   {
     "elapsed_s": "[..]",
     "event": "suite_complete"

crates/libtest2/tests/testsuite/mixed_bag.rs

@@ -1026,7 +1026,7 @@ test result: FAILED. 2 passed; 1 failed; 5 ignored; 0 filtered out; finished in
 #[test]
 fn fail_fast() {
     check(
-        &[],
+        &["--fail-fast"],
         101,
         str![[r#"
 
@@ -1035,10 +1035,6 @@ test bear  ... ignored
 test bunny ... ignored
 test cat   ... ok
 test dog   ... FAILED
-test fly   ... ignored
-test fox   ... ok
-test frog  ... ignored
-test owl   ... ignored
 
 failures:
 
@@ -1049,7 +1045,7 @@ was not a good boy
 failures:
     dog
 
-test result: FAILED. 2 passed; 1 failed; 5 ignored; 0 filtered out; finished in [..]s
+test result: FAILED. 1 passed; 1 failed; 2 ignored; 0 filtered out; finished in [..]s
 
 
 "#]],
@@ -1064,7 +1060,7 @@ test result: FAILED. 2 passed; 1 failed; 5 ignored; 0 filtered out; finished in
 #[cfg(feature = "json")]
 fn fail_fast_json() {
     check(
-        &["-Zunstable-options", "--format=json"],
+        &["-Zunstable-options", "--format=json", "--fail-fast"],
         101,
         str![[r#"
 [
@@ -1152,48 +1148,6 @@ fn fail_fast_json() {
     "name": "dog",
     "status": "failed"
   },
-  {
-    "event": "case_start",
-    "name": "fly"
-  },
-  {
-    "elapsed_s": "[..]",
-    "event": "case_complete",
-    "message": "fails",
-    "name": "fly",
-    "status": "ignored"
-  },
-  {
-    "event": "case_start",
-    "name": "fox"
-  },
-  {
-    "elapsed_s": "[..]",
-    "event": "case_complete",
-    "name": "fox"
-  },
-  {
-    "event": "case_start",
-    "name": "frog"
-  },
-  {
-    "elapsed_s": "[..]",
-    "event": "case_complete",
-    "message": "slow",
-    "name": "frog",
-    "status": "ignored"
-  },
-  {
-    "event": "case_start",
-    "name": "owl"
-  },
-  {
-    "elapsed_s": "[..]",
-    "event": "case_complete",
-    "message": "fails",
-    "name": "owl",
-    "status": "ignored"
-  },
   {
     "elapsed_s": "[..]",
     "event": "suite_complete"